but

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but he can't assume the females will actually turn up.
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but he can't assume the females will actually turn up. 但却没有看到雌驴的出现

and in prime condition, but only a few will mate.
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and in prime condition, but only a few will mate. 精神焕发.然而只有为数不多的公牛会和母牛交配

but no animal is immune to intensive hunting by man
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but no animal is immune to intensive hunting by man 然而没有哪种动物能够幸免于人类的大捕杀

But further south, summers are longer and the grasslands flourish.
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But further south, summers are longer and the grasslands flourish. 但是在更远的南边 夏天的时间更长,草原更加茂盛

But the mother has given her cubs the best possible start in life.
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But the mother has given her cubs the best possible start in life. 但是母亲已经给了它们一个最好的开端

But it's no easy task to locate prey that never stops travelling.
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But it's no easy task to locate prey that never stops travelling. 但若想找到这些 脚步永不停止的猎物又谈何容易?

But the nesting season is short.
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But the nesting season is short. 但是雪雁的繁殖季很短

She's driven away from every nest, but hunger compels her to continue.
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She's driven away from every nest, but hunger compels her to continue. 这只狐狸四处碰壁但在饥饿的驱使下始终不肯放弃努力

It's a long way to travel, but for a short period, the tundra is the ideal place for a grazer.
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It's a long way to travel, but for a short period, the tundra is the ideal place for a grazer. 北极的苔原虽然路途遥远, 但仍有短短的一段时间是食草动物的天堂

But it's about to change.
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But it's about to change. 但这一切即将发生变化